The short version
Just 2 companies supply this market — thin enough that a single exit would be felt immediately.
Market view
7 marketed package NDCs · 2 active manufacturers
Most dispensed: Kit · #90 boxs/carton / 1 kit in 1 box * 1 for suspension in 1 packet * 1 for suspension in 1 packet · 500 mg · Tablet · #1 bottle/carton / 250 tablet in 1 bottle
Just 2 companies supply this market — thin enough that a single exit would be felt immediately.
Other molecules FDA puts in Nitrogen Binding Agent, with whether each is in shortage right now. Same class is not the same drug — substitution is a clinical decision, and this is a supply picture, not a recommendation.
Expand a strength to see its dosage forms, then package sizes, then each manufacturer and NDC. Click an NDC for its full detail page.